A frameless motor rotor and frameless motor

Abstract

The utility model discloses a frameless motor rotor and frameless motor. Rotor includes center axle, rotor seat with axle hole and several magnetic steel, center axle is pressed and fits connection in axle hole, rotor seat includes axial cylinder and radial board, radial board is set in axial cylinder, and axle hole is set up on radial board, several magnetic steel is pasted in the outer wall surface of axial cylinder along the circumferential direction of axial cylinder in proper order, wherein, rotor seat is integrated structure spare. The utility model integrates the rotor seat and the axle seat with bottom into one part with the existing rotor seat and axle seat with bottom, and is formed once through the turning processing mode, only needs to guarantee rotor seat outer diameter installation accuracy, roundness and perpendicularity on part processing, solves the risk of uncontrolled size chain of multiple parts, also solves the rotor seat and axle seat with bottom of existing frameless motor respectively processing, then axle seat with bottom inner ring and rotor seat outer ring each processing accuracy can be inconsistent, then after the two are bonded through glue, will lead to the coaxiality of whole product and rotor unbalance.

Description

Technical Field

[0001] This utility model relates to the field of motor component technology, and in particular to a frameless motor rotor and a frameless motor. Background Technology

[0002] Frameless motors eliminate the mounting frame, resulting in a smaller size and saving installation space. This facilitates the miniaturization of motors and makes them more suitable for applications in microstructures, such as robot drive joints and drive wheels.

[0003] like Figure 1 , 2 The existing frameless motor includes a shaft 1', a base bearing 2', and a rotor housing 3' with magnets 4'. The base bearing 2' is glued to the cavity of the rotor housing 3', and the shaft 1' is fixed to the bearing 2' using pins 5' and screws. However, this frameless motor structure has the following problems: 1) Regarding the machining difficulties of rotor seat 3', ① it is necessary to ensure the roundness and perpendicularity of the mounting surfaces of rotor seat 3' and bottom shaft seat 2', as well as the accuracy of the foundation installation dimensions; ② it is necessary to ensure the flatness and height of the flange step; ③ it is necessary to ensure the flatness of the mounting surfaces of rotor seat 3' and shaft 1', as well as the positional accuracy of the screw holes and positioning holes.

[0004] 2) Regarding the machining difficulties of the bottom bearing seat 2', it is necessary to ensure the roundness and perpendicularity of the inner and outer circles of the bottom bearing seat 2', as well as the accuracy of the foundation installation dimensions.

[0005] 3) Regarding the machining difficulties of shaft 1', ① it is necessary to ensure the perpendicularity and coaxiality of the mounting flange of shaft 1' and gear shaft 1'; ② it is necessary to ensure the diameter and position of the bolt holes of the mounting flange; ③ it is necessary to ensure the diameter and position of the positioning hole of pin 5'.

[0006] 4) Regarding the difficulties in component installation: ① The rotor seat 3' and the bottom shaft seat 2' are fixed with glue. The machining accuracy of the inner ring of the bottom shaft seat 2' and the outer ring of the rotor seat 3' directly affects the coaxiality of the entire product, resulting in poor rotor balance; ② The rotor seat 3' and the shaft 1' are fixed with screws and positioning pins, which increases the labor intensity of personnel and also poses the risk of missing screws or screws not being tightened properly.

[0007] 5) The modular machining and assembly method increases the number of parts, making the dimensional chain of the entire rotor assembly complex and difficult to control. In actual production, to ensure the roundness and perpendicularity of the rotor seat and the hollow shaft mounting surface, as well as the accuracy of the foundation installation dimensions, and the roundness and perpendicularity of the inner and outer circles of the hollow shaft, a great deal of effort is required for precision machining and strict quality control. Furthermore, the flatness of the mounting surface between the rotor seat and the central shaft, and the positional accuracy of the screw holes and locating holes also need precise control. Utility Model Content

[0008] Based on this, it is necessary to provide a frameless motor rotor and a frameless motor to address the above-mentioned technical problems, aiming to solve many problems existing in the processing and assembly of rotor components in the prior art, such as a large number of parts, complex dimensional chains, poor coaxiality, poor balance, and low assembly efficiency.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: In a first aspect, this utility model provides a frameless motor rotor, which includes a central shaft, a rotor seat with a shaft hole, and a plurality of magnets; the central shaft is press-fitted into the shaft hole; the rotor seat includes an axial cylinder and a radial plate, the radial plate being transversely disposed within the axial cylinder, and the shaft hole being formed on the radial plate; the plurality of magnets are sequentially attached to the outer wall surface of the axial cylinder along its circumference; wherein, the rotor seat is an integrally formed structural component.

[0010] Furthermore, the bottom of the outer wall of the axial cylinder is provided with an outer flange.

[0011] Furthermore, the edge of the shaft hole extends axially to form a boss hole.

[0012] Furthermore, the outer wall surface of the axial cylinder is provided with several glue storage grooves.

[0013] Furthermore, one end of the central shaft is provided with a collar, and the other end is provided with a gear.

[0014] Furthermore, a guide groove is provided on the side of the collar away from the gear.

[0015] Furthermore, both ends of the central shaft are provided with blind holes with pointed tips to facilitate the detection of rotor coaxiality.

[0016] Furthermore, the thickness of the collar is less than the wall thickness of the boss hole.

[0017] Furthermore, the central shaft is reinforced by welding after being press-fitted into the shaft hole.

[0018] Secondly, this utility model also provides a frameless motor, which includes the rotor as described above.

[0019] Compared with the prior art, the present invention has the following beneficial effects: This utility model provides a frameless motor rotor, in which the rotor seat with shaft holes is machined in one step. It integrates the existing rotor seat and the base-mounted shaft seat into a single part, formed in one machining operation. In part processing, only the installation accuracy, roundness, and perpendicularity of the rotor seat's outer diameter need to be ensured, thus resolving the risk of uncontrollable dimensional chains among multiple parts. It also addresses the issue of separate machining of the rotor seat and the base-mounted shaft seat in existing frameless motors, where inconsistent machining accuracy between the inner ring of the base-mounted shaft seat and the outer ring of the rotor seat leads to poor coaxiality and rotor balance after adhesive bonding. Furthermore, the central shaft and rotor seat are installed using an integrated press-fit method, eliminating the risk of insufficient structural strength due to missing screws or inadequate screw tightening. This simplifies the operation process, saves labor costs, and eliminates flanges and positioning holes, reducing material waste and processing costs.

[0020] This invention effectively reduces the number of parts, simplifies the processing flow, and improves the coaxiality and balance of the rotor assembly, thereby enhancing the overall performance and reliability of the product. Attached Figure Description

[0021] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of an existing frameless motor rotor; Figure 2 for Figure 1 A schematic diagram of the decomposition process; Figure 3 This is a schematic diagram of the frameless motor rotor of this utility model; Figure 4 for Figure 3 A schematic diagram of the decomposition process; Figure 5 This is a schematic diagram of the frameless motor rotor of this utility model from another perspective; Figure 6 for Figure 3 Side view; Figure 7 for Figure 6 Sectional view at point AA; Figure 8 for Figure 6 A sectional perspective view at point AA, where the magnet is hidden. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0025] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] Example 1: Frameless Motor Rotor Please refer to Figure 3-8 This embodiment provides a frameless motor rotor, which includes a central shaft 1, a rotor seat 2 with a shaft hole 21, and several magnets 3.

[0028] The rotor seat 2 includes an axial cylinder 22 and a radial plate 23. The radial plate 23 is horizontally arranged inside the axial cylinder 22, and the shaft hole 21 is opened in the middle of the radial plate 23. The central shaft 1 is press-fitted into the shaft hole 21 to realize the connection between the central shaft 1 and the rotor seat 2. The rotor seat 2 is an integrally formed structural component. "Integrally formed structure" means that the rotor seat is formed into a whole through one processing (such as turning) rather than being assembled from multiple independent parts.

[0029] The rotor housing 2 is formed in one step by precision turning, cutting a single piece of metal material using a CNC lathe. During the turning process, the dimensions, coaxiality, perpendicularity, and surface roughness of each component of the rotor housing can be precisely controlled, ensuring the geometric accuracy of the entire rotor body and avoiding the coaxiality problems caused by assembly errors in traditional split structures. Because the coaxiality of the rotor housing body is significantly improved, precise alignment can be achieved more easily when installing other components such as magnets and the central shaft, further guaranteeing the coaxiality of the entire rotor assembly. This high-precision rotor assembly maintains good dynamic balance performance during motor operation, effectively reducing vibration and noise, and improving motor operating efficiency and service life.

[0030] By forming the rotor in one step through turning, the machining of the parts only needs to ensure the installation accuracy, roundness and perpendicularity of the outer diameter of the rotor seat 2. This solves the risk of uncontrollable dimensional chains of multiple parts. It also solves the problem that in the existing frameless motor, the rotor seat 2 and the bottom shaft seat are machined separately. In this case, the machining accuracy of the inner ring of the bottom shaft seat and the outer ring of the rotor seat 2 may be inconsistent. If the two are glued together, it will lead to poor coaxiality and rotor balance of the entire product.

[0031] Several magnets 3 are sequentially attached to the outer wall of the axial cylinder 22 along its circumference. Furthermore, the bottom of the outer wall of the axial cylinder 22 is provided with an outer flange 24. When the magnets 3 are attached, the outer flange 24 not only supports the magnets 3 but also positions them, facilitating the attachment of the magnets 3.

[0032] Furthermore, the outer wall surface of the axial cylinder 22 is provided with several glue storage grooves 26. More specifically, the glue storage grooves 26 can be multiple annular grooves arranged side-by-side from top to bottom, or they can be spiral grooves. Before bonding the magnet 3, glue is applied to the outer wall surface of the axial cylinder 22. The glue storage grooves 26 are used to store some glue, improving the bonding stability of the magnet 3. In this embodiment, spiral grooves are preferred. Compared to traditional annular glue storage grooves, spiral grooves can increase the length of the glue storage groove, thereby increasing the amount of glue stored and improving the dynamic balance performance of the rotor assembly. Secondly, the spiral structure of the spiral groove allows the glue to be distributed more evenly within the glue storage groove, further improving the balance performance of the rotor assembly.

[0033] Furthermore, the edge of the shaft hole 21 extends axially to form a boss hole 25. With this design, the boss hole 25 has a certain height compared to the shaft hole 21, which is more conducive to strengthening the connection stability between the central shaft 1 and the rotor seat 2.

[0034] Furthermore, one end of the central shaft 1 is provided with a collar 11, and the other end is provided with a gear 12. A guide groove 13 is provided on the side of the collar 11 away from the gear 12. With this structural design, when the central shaft 1 needs to be pressed into the shaft hole 21, the pressure rod applying force can be directly positioned and abutted against the guide groove 13 before pressing the central shaft 1 into the shaft hole 21. The structural design is simple and convenient, and there is no concern about offset or displacement during the pressing process, which would affect the overall coaxiality of the rotor.

[0035] Furthermore, both ends of the central shaft 1 are provided with blind holes 14 with pointed tips 15 to facilitate the detection of rotor coaxiality. With this structural design, when coaxiality detection is required after the central shaft 1 is pressed into the rotor seat 2, the shaft of the testing machine can simply abut against the pointed tips 15 at both ends of the central shaft 1, which is simpler and more convenient than the existing coaxiality detection process.

[0036] Furthermore, the thickness a of the collar 11 is less than the wall thickness b of the boss hole 25. With this design, when the central shaft 1 is pressed in, the boss hole 25 can ensure the bearing capacity of the pressing and will not cause deformation of the rotor seat 2, thus ensuring the coaxiality of the rotor as a whole after pressing in.

[0037] Furthermore, after the central shaft 1 is press-fitted into the shaft hole 21, it is reinforced by welding to further strengthen the connection between the central shaft 1 and the rotor seat 2. Various welding processes can be used, such as laser welding, resistance welding, and friction welding, with laser welding being preferred. The purpose is to form a metallurgical bond between the central shaft and the rotor seat, providing a connection strength far exceeding that of a press-fit. Compared to a press-fit method, welding effectively prevents the central shaft from loosening or detaching during high-speed rotation or under heavy loads, thereby extending the service life of the rotor assembly and improving its operational stability and safety. This improvement not only enhances the overall structural integrity of the rotor assembly but also provides reliable protection for its application in more demanding working environments.

[0038] Example 2 The frameless motor in this embodiment includes the frameless motor rotor as in Embodiment 1.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A frameless motor rotor, characterized in that, It includes a central shaft, a rotor seat with a shaft hole, and several magnets; the central shaft is press-fitted into the shaft hole; the rotor seat includes an axial cylinder and a radial plate, the radial plate is transversely arranged in the axial cylinder, and the shaft hole is opened on the radial plate; the several magnets are sequentially attached to the outer wall surface of the axial cylinder along the circumference of the axial cylinder; wherein, the rotor seat is an integrally formed structural component.

2. The frameless motor rotor according to claim 1, characterized in that, The bottom of the outer wall of the axial cylinder is provided with an outer flange.

3. The frameless motor rotor according to claim 1, characterized in that, The edge of the shaft hole extends axially to form a boss hole.

4. The frameless motor rotor according to claim 1, characterized in that, The outer wall of the axial cylinder is provided with several glue storage tanks.

5. The frameless motor rotor according to claim 1, characterized in that, One end of the central shaft is provided with a collar, and the other end is provided with a gear.

6. The frameless motor rotor according to claim 5, characterized in that, The collar has a guide groove on the side away from the gear.

7. The frameless motor rotor according to claim 5 or 6, characterized in that, Both ends of the central shaft are provided with pointed blind holes to facilitate the detection of rotor coaxiality.

8. The frameless motor rotor according to claim 5, characterized in that, The thickness of the collar is less than the wall thickness of the boss hole.

9. The frameless motor rotor according to claim 1, characterized in that, The central shaft is press-fitted into the shaft hole and then reinforced by welding.

10. A frameless motor, characterized in that, It includes the rotor as described in any one of claims 1-9.

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